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The "you can't be an environmentalist if you do x" statements that die-hards make are just going to alienate people who want to do something but lack the time, money and energy to ride their bike everywhere to find all the vegan, organic, earth-friendly products they need to live their lives. We're never going to get anything done to help the planet if environmentalism is limited to hard-core extremists. It needs to be an inclusive movement that invites people to make realistic and gradual steps; you're not going to get people to change overnight, and you definitely won't accomplish that by being a jerk.